Antivibration support



March 13, 1934. H. F. HOEVEL 5 ANTI VIBRATION SUPPORT Filed Aug. 22,1931 m I 23 {2 H 23 INVENTOR HERMAN E f/OEVEL BY fiad-m 4 ATTORNEYSPatented Mar. 13, 1934 UNITED STATES PATENT" OFFICE 3 Claims.

My invention relates to supports for machinery or other articles subjectto vibrations, and has for its object to provide an improvedconstruction for preventing such vibrations from being transmitted tothe floor or other structural element on which the support is mounted.Separate provision is made for damping vibrations occurring in differentdirections, for instance horizontal and vertical, and my improvedsupport can be readily varied and adjusted to meet different conditions.

Without desiring to restrict myself to the details illustrated, I willnow proceed to describe two typical embodiments of my invention withreferonce to the accompanying drawing, in which Fig. 1 is a plan viewshowing one form of my invention; Fig. 2 is a vertical section on line2-2 of Fig. 1; Fig. 3 is a partial plan View of another embodiment; andFig. 4 is a partial vertical section, on line 44 of Fig. 3.

At 11 I have indicated the bottom plate having holes 12 adapted toreceive bolts (not shown) for securing said plate to the floor or othersupport. Upon this plate is mounted the housing 13, secured 5 thereto bybolts 14 which extend into registering holes of the bottom plate and ofthe flange at the lower end of the housing. This flange may also haveholes 13' in registry with the holes 12, so that the bolts securing thebottom plate 11 to the hour or other foundation will also serve tofasten the housing to the bottom plate. The housing has a centralopening through which projects upwardly a central projection at the topof a supporting member 16, the major portion of which.

is located within the housing 13. The opening in the top of the housingis large enough to permit play of the supporting member 16 horizontallyin both directions (from front to rear and from side to side), and thebody or inner portion of said member is spaced from the surroundingwalls of the housing, for the same purpose. In addition to being movablehorizontally, the supporting member 16 is also capable of an up-and-downmovement in unison with the supported machine,

one leg of which is indicated at 15. This leg is secured or clamped inposition by means of a. bolt 18, nut 20, and lock nut 19. It will beunderstood that there will be as many antivibration supports of thecharacter herein set forth, as the machine has legs 15 or equivalentparts. While the housing 13 has been shown as square in plan view, thisparticular shape is not essential to my invention.

The bolt 18 screws into the supporting member 16, and the lower end ofsaid bolt engages a steel plate or abutment 21, located and guided forupand-down movement in a chamber 16 at the top of said member, saidabutment being engaged by the upper end of a coiled spring 17, the lowerend of which bears upon another steel plate 22 resting on a layer(plate) 23 of a material, for instance cork, which is elastic and assuch has the property of insulating, that is, of deadening or dampingvibrations and sound. The tension of the spring 17 may be adjusted withthe aid of the screw bolt 18, which permits of varying the distancebetween the abutment 21 and the top of the supporting member 16.

My invention relates particularly to means interposed between thehousing 13 and the supporting member 16 to engage the sides and the topof said member. Between the top of the housing and the marginal portionof the top of the supporting member, I interpose a layer (sheet) 24 ofelastic insulating material, for in- '15 stance celotex or balsa wood,which should have sufiicient structural strength to resist or counteractthe pressure of the spring 1'7, which is precompressed when the deviceis assembled at the factory, and to take up upward vibrations after thedevice has been installed. The inner edge of said insulating material 24is preferably in engagement with vertical surfaces on the central upwardprojection of the supporting member 16, so as to hold said material inits desired position, and so as to allow the said supporting member tosimply slide (without any wedging action) Where it engages said edge,during the up-and-down vibrations of said supporting member. Anotheradvantage of this feature is that it will prevent the formation, betweenthe member 16 and the insulating material 24, even during verticalvibrations of said member, of a crack through which grit or otherforeign matter might enter. On the sides of the supporting member 16, inengagement with the outer surface thereof, I provide insulating material25, preferably considerably more elastic than the top material 24, butthe structural strength of this material 25 generally need not be asgreat as that of the material 24. As a suitable material for the laterallayers 25, I may use cork, this being of smaller structural strength butgreater elasticity than celotex or balsa Wood. In cases where lateralpressure is exerted by the pull of a belt or other forces against theside insulating material 25, I should use material of greater structuralstrength on the particular side or sides toward which such forces areexerted, to withstand such lateral pressure. When the housing is ofquadrilateral (square) form as shown, four layers or sheets of thematerial 25 would preferably be used, each of them engaging one side ofthe supporting member 16, it being understood that the body of suchmember has a cross section similar to that of the housing, that is tosay, a square cross section in the particular embodiments shown. Theelastic material 25 takes up horizontal vibrations, while verticalvibrations are taken up largely by the spring 17 and partly by theelastic layers 23 and 24. Transmission of vibrations to the base plate11 and to the foundation will thus be efficiently prevented, and noisewill be minimized. V I 7 While the outer faces of the layers 25 might bein direct contact with the inner surface of the housing 13, I find itdesirable to interpose shims, preferably wedge-shaped, between suchparts, so that the layers 25 may be held in place more securely and mayalso be given an initial compression or precompression.

In Figs. 1 and 2, the shims 26 taper upwardly, their outer surfacesbeing inclined to match similarly inclined inner faces of the housing13.- The lower edges of these shims engage the bottom plate 11. Thus,when the housing 13 is drawn down by the bolts 14 in assembling thedevice, a wedge action will be exerted between the housing and the shimsto compress the material 25 between such shims and the sides of thesupporting member 16.

In Figs. 3 and 4 the shims 26, instead of tapering upwardly, are taperedhorizontally, from one end to the other, the inner surface of thehousing having oblique vertical surfaces of an inclination correspondingto such taper, as shown clearly in Fig. 3. Horizontal screws 27,threaded into the housing 13, engage the wedge-shaped shims 26' at theirwide ends, and it will be obvious that by means of said screws the shimsmay be moved longitudinally to compress the insulating layers 25 to thedesired extent, after the device has been installed.

Various modifications may be made without departing from the nature ofmy invention as set'forth in the appended claims.

I claim:

1. An anti-vibration support comprising a stationary member, anelastically mounted movable member adapted for connection with thestructure to be supported, insulating elastic material interposedbetween said members to take vertical strains, separate elasticinsulating material located between the sides of said members, and shimsengaging said lateral insulating material, said shims being wedge-shapedto compress the insulating material.

2. An anti-vibration support according to claim 1, in which the shimsare tapered vertically to permit of precompressing the lateralinsulating material duringthe assembling of the support.

3. An anti-vibration support according to claim 1, in which the shimsare tapered lengthwise and co-operate with oblique surfaces on thestationary member.

HERMAN F. HOEVEL.

